Transifex sync for 3.6

htdocs/langs/ar_SA/admin.lang

htdocs/langs/ar_SA/agenda.lang

htdocs/langs/ar_SA/commercial.lang

htdocs/langs/ar_SA/companies.lang

htdocs/langs/ar_SA/compta.lang

htdocs/langs/ar_SA/languages.lang

htdocs/langs/ar_SA/main.lang

htdocs/langs/ar_SA/projects.lang

htdocs/langs/ar_SA/stocks.lang

htdocs/langs/ar_SA/users.lang

htdocs/langs/bg_BG/admin.lang

htdocs/langs/bg_BG/agenda.lang

htdocs/langs/bg_BG/boxes.lang

htdocs/langs/bg_BG/commercial.lang

htdocs/langs/bg_BG/companies.lang

htdocs/langs/bg_BG/compta.lang

htdocs/langs/bg_BG/languages.lang

htdocs/langs/bg_BG/main.lang

htdocs/langs/bg_BG/projects.lang

htdocs/langs/bg_BG/salaries.lang